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Friday 7 September 2007

Diamond Information

The Diamond is the birthstone of April and the anniversary gemstone for the 10th and 60th years of marriage. Diamonds were discovered in India in 500 B.C., and the name "diamond" comes from the Greek word "Adamas" which means unconquerable - suggesting the eternity of love. Since ancient Greece, diamonds and diamond jewelry have been the traditional symbol of love, and the ancients believed they were hardened dew drops, splinters from the stars or crystallized lightning. A diamond is the hardest substance known to humankind, and is made of a crystallized carbon that has unique powers of light reflection. Since diamonds are composed of a single element, they are the purest of all gemstones.


The Structure of a Diamond
Proportion refers to the angles and relative measurements of a polished diamond. More than any other feature, proportions determine a diamond's optical properties. Studies have shown that table size, crown angle, and pavilion depth have a dramatic effect on a diamond's appearance.

Symmetry is a grading term for the exactness of shape and placement of facets. Variations in symmetry include off-center culets and tables, poor facet alignment, misshapen facets, out-of-round girdles, and wavy girdles.


Reflection Refraction Dispersion

A) When a ray of light touches the surface of a diamond, part of the light is reflected back, this is external reflection.

B) The rest of the ray penetrates the stone and is then reflected toward the center of the diamond. This is known as refraction.

C) The ray of light is reflected to the surface, where it is seen as the colors of the spectrum. This is known as dispersion.



The Value of a Diamond: The Four C's

Shape (Cut)

The Cut is the factor that determines the brilliance of a diamond. A classic round brilliant cut diamond has 58 facets : 33 on the top, 24 on the bottom, and the culet (1 point at the bottom). Each of the diamond's facets must be placed in exact geometric relation to one another when the stone is being cut. Quality diamonds must be properly cut and not "spread", which means that the proper proportions are compromised to make the diamond weigh more.

Clarity

Diamond Clarity
The Clarity of a diamond is based on the number, location, size, and type of inclusions found in the stone. An inclusion is an imperfection or trace mineral in the stone that is visible under the magnification of a jeweler's loupe. The fewer inclusions the diamond has; the clearer, more brilliant and more expensive the diamond will be. A "Flawless" diamond is one that has no inclusions and is extremely rare and valuable.


COLOR

Colorless and near-colorless diamonds are the most valuable. Though most diamonds may appear colorless to the naked eye, the majority of diamonds contain slight traces of yellow or light brown when viewed under a jeweler's loupe. Depending on the stone's size, a single increase in color grade can boost the value of a diamond by thousands of dollars per carat. A traditional engagement diamond is usually colorless or near-colorless.

In nature, diamonds can also occur in shades of red, pink, blue, green and deep yellow - These are called "Fancy diamonds". In the United States and around the world colorless diamonds are graded on an alphabetical scale, introduced by the Gemological Institute of America (GIA). "Colorless" or "rare white" diamonds are of color grades D, E and F. Diamonds of color grade D are very rare, and extremely valuable.


Carat Weight

The weight of a diamond is measured in carats (ct.). Each carat is divided into 100 points. For example: 1ct.= 100 points, 1/2 ct. = 50 points. Points in a fraction are measured within acceptable ranges. For example: a 1/2 ct diamond pendant may have a range of + or - .06 points. In other words, the total diamond weight may vary from .44 to .56 points and still be considered a 1/2 carat. Here are the most popular carat fractions and their approximate decimal equivalents:
1/10 - .08 - .12
1/5 - .17 - .23
1/4 - .21 - .29
1/3 - .27 - .39
1/2 - .44 - .56
3/4 - .69 - .81
1.0 - .94 - 1.06
11/4 - 1.18 - 1.32
11/2 - 1.43 - 1.57
The carat weight alone is almost meaningless unless you also consider the cut, clarity and color of the diamond. A large diamond is not very valuable if it lacks brilliance, purity and high-grade color. However, since larger stones are rarer than smaller ones, diamond value rises exponentially with carat weight. Therefore, a diamond weighing 3.0 carats, will always be worth more than three 1.0 carat stones of the same quality. No two diamonds are exactly alike, and you must weigh all of the factors - color, cut, clarity and carat weight - when making your diamond jewelry buying decision.


Diamond Jewelry Collection

Jewelry Central is pleased to present high quality Diamond Jewelry in classic and modern styles: rings, earrings, necklaces and pendants.

14k Gold Diamond Stud Earrings (I/H-I, 1/4 ct. tw.)
14k White Gold Three-Stone Diamond Drop Pendant
14k Gold Four-Prong Princess Cut Diamond Solitaire Pendant (SI/H-I, 1/4 ct. tw.)
14k White Gold "I Love You" Diamond Band (1/4 ct. tw.)
14k Gold Diamond Solitaire Ring (SI/H-I, 1/4 ct. tw.)
18k Gold Three-Stone Diamond Ring

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The Beautiful Company – Diamond Information sheet

What Are Diamonds

Natural diamonds are pure carbon, formed into crystals deep below the earths crust millions of years ago. Diamonds are found and mined in several parts of the world but predominantly in South Africa. Diamonds are the hardest natural substance known to man and when found they are far from the cut and polished gemstones you will see in our diamond rings and are known as “rough diamonds”. The diamonds used in our diamond jewellery have been sourced from specialist cutting and polishing centres all over the world, and we warrant that no diamonds known as “conflict diamonds” are knowingly sold and to the best of our ability we have undertaken measures to prevent their sale including obtaining written assurances from all our suppliers that all our diamond jewellery is conflict free.

What are “Conflict Diamonds”

In 1998 it was discovered that UNITA, a rebel group in Angola was funding its war against a legitimate government by the control and sale of rough diamonds, these have since been known as “conflict diamonds” and rebel groups in Sierra Leone and the Democratic Republic of Congo also funded conflicts in this way. At its peak the trade in conflict diamonds was estimated to be less than 4% of annual rough diamond production and is now estimated to be less than 1%. But we believe that one diamond traded in this way is one too many, hence our efforts to get written assurances from all our suppliers that all our jewellery including our diamond solitaire and diamond eternity rings is conflict free.

BUYING GUIDE – Diamond Rings, Diamond Pendants, Diamond Earrings

4Cs of Diamonds are Cut, Clarity, Carat, and Colour

When buying a diamond ring, diamond pendant or diamond earrings from The Beautiful Company the prices we charge for a particular ring depends on the interplay of all the 4Cs, Cut, Clarity, Carat, and Colour of the diamond and the amount and type of metal used in the setting.

The 4Cs are used throughout the world to classify the rarity of diamonds. Diamonds with the combination of the highest 4C ratings are more rare and, consequently, more expensive. No one C is more important than another in terms of beauty and it is important to note that each of the 4Cs will not diminish in value over time.

Once you have established those 4C characteristics that are most important to you then look on the site and find the diamond solitaire ring or diamond eternity ring that best meets your desires in terms of price and quality. The 4C’s are explained below.

CARAT

Carat is a measure of the weight of a diamond or with diamond rings, diamond pendants or diamond earrings it’s also used to describe the total weight of diamonds the item has.
Carat is often confused with size even though it is actually a measure of weight. One carat is equivalent to 200 milligrams. One carat can also be divided into 100 "points." A .75 carat diamond is the same as a 75-points or 3/4 carat diamond.

A 1-carat diamond costs exactly twice the price of a half-carat diamond, right? Wrong. Since larger diamonds are found less frequently in nature, which places them at the rarest level of the Diamond Quality Pyramid, a 1-carat diamond will cost more than twice a 1/2-carat diamond (assuming colour, clarity and cut remain constant). This also means a 1 carat diamond solitaire ring will be more expensive than a 1 carat diamond eternity ring, diamond trilogy ring or a diamond eternity ring that contains more than one diamond, providing the clarity of the diamond solitaire ring is equivalent to that of the others.

CLARITY

Clarity Refers to the presence of inclusions or imperfections in a diamond.

Every diamond and therefore every diamond ring is unique. Nature ensures that each diamond is as individual as the person who wears it. Naturally-occurring features known as inclusions provide a special fingerprint within the stone. Inclusions are natural identifying characteristics such as minerals or fractures, appearing while diamonds are formed in the earth. They may look like tiny crystals, clouds or feathers.

To view inclusions, jewellers use a magnifying loupe. This tool allows jewellers to see a diamond at 10x its actual size so that inclusions are easier to see. The position of inclusions can affect the value of a diamond. There are very few flawless diamonds found in nature, thus these diamonds are much more valuable.

Inclusions are ranked on a scale of perfection, known as clarity, which was established by the Gemological Institute of America (GIA). The clarity scale, ranging from F (Flawless) to Included (I), is based on the visibility of inclusions at a magnification of 10x.

Some inclusions can be hidden by a mounting, thus having little effect on the beauty of a diamond. An inclusion in the middle or top of a diamond could impact the dispersion of light, sometimes making the diamond less brilliant.

The greater a diamond's clarity, the more brilliant, valuable and rare it is and the higher it is on the Diamond Quality Pyramid.


Clarity

Description

FL - IF

Flawless/internally flawless

VVS1 - VVS2

Very, very small inclusions, very hard to locate under a 10x, unable to see with the unaided eye

VS1- VS2

Very small inclusions, hard to locate under a 10x, unable to see with the unaided eye

SI1 - SI2

Slight inclusions, easy to locate under a 10x, but unable to see with the unaided eye

I1 I2 I3

Inclusions – which can be visible to the unaided eye – collectively known as P Clarity

COLOUR

Colour Refers to the degree to which a diamond is colourless.

Diamonds are found in almost every colour of the rainbow, but white-coloured diamonds remain most popular.

Diamonds are graded on a colour scale established by the Gemological Institute of America (GIA) which ranges from D (colourless) to Z. Warmer coloured diamonds (K­Z) are particularly desirable when set in yellow gold. Icy winter whites (D­J) look stunning set in white gold or platinum.

Colour differences are very subtle and it is very difficult to see the difference between, say, an E and an F. Therefore, colours are graded under controlled lighting conditions and are compared to a master set for accuracy.

Truly colourless stones, graded D, treasured for their rarity, are highest on the Diamond Quality Pyramid. Colour, however, ultimately comes down to personal taste. Ask a jeweller to show you a variety of colour grades next to one another to help you determine your colour preference.

Nature has also created diamonds in intense shades of blue, green, yellow, orange, pink or ­ rarest of all ­ red. These diamonds are called coloured fancies and are extremely rare and highly treasured.

Here's a grid that will help you understand the colour grades of diamonds:


Colour of Stone

Description of Colour code

D

EXCEPTIONAL WHITE

Diamond colour

E

F

RARE WHITE

Diamond colour

G

H

WHITE

Diamond colour

I

SLIGHTLY TINTED WHITE

Diamond colour

J

CUT

Cut Refers to the angles and proportions of a diamond.

Nature determines so much about a diamond, but it takes a master cutter to reveal the stone¹s true brilliance, fire and ultimate beauty.

Based on scientific formulas, a well-cut diamond will internally reflect light from one mirror-like facet to another and disperse and reflect it through the top of the stone. This results in a display of brilliance and fire, thereby placing well-cut diamonds higher on the Diamond Quality Pyramid than deep or shallow-cut diamonds. Diamonds that are cut too deep or too shallow lose or leak light through the side or bottom, resulting in less brilliance and ultimately, value.

Cut also refers to shape round, square, pear, or heart for example. Since a round diamond is symmetrical and capable of reflecting nearly all the light that enters, it is the most brilliant of all diamond shapes and follows specific proportional guidelines.

Non-round shapes, also known as "fancy shapes", will have their own guidelines to be considered well-cut


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